diff --git a/NEWS b/NEWS
index f43df1bda..4503a78fe 100644
--- a/NEWS
+++ b/NEWS
@@ -1,4 +1,6 @@
 ver 0.23.1 (not yet released)
+* protocol
+  - use decimal notation instead of scientific notation
 * output
   - pipewire: attempt to change the graph sample rate
   - snapcast: fix time stamp bug which caused "Failed to get chunk"
diff --git a/src/SongPrint.cxx b/src/SongPrint.cxx
index 5a72473e0..dc05bed53 100644
--- a/src/SongPrint.cxx
+++ b/src/SongPrint.cxx
@@ -100,7 +100,7 @@ song_print_info(Response &r, const LightSong &song, bool base) noexcept
 	const auto duration = song.GetDuration();
 	if (!duration.IsNegative())
 		r.Fmt(FMT_STRING("Time: {}\n"
-				 "duration: {:1.3}\n"),
+				 "duration: {:1.3f}\n"),
 		      duration.RoundS(),
 		      duration.ToDoubleS());
 }
@@ -123,7 +123,7 @@ song_print_info(Response &r, const DetachedSong &song, bool base) noexcept
 	const auto duration = song.GetDuration();
 	if (!duration.IsNegative())
 		r.Fmt(FMT_STRING("Time: {}\n"
-				 "duration: {:1.3}\n"),
+				 "duration: {:1.3f}\n"),
 		      duration.RoundS(),
 		      duration.ToDoubleS());
 }
diff --git a/src/TagPrint.cxx b/src/TagPrint.cxx
index 7b338751a..e4d80e9bf 100644
--- a/src/TagPrint.cxx
+++ b/src/TagPrint.cxx
@@ -60,7 +60,7 @@ tag_print(Response &r, const Tag &tag) noexcept
 {
 	if (!tag.duration.IsNegative())
 		r.Fmt(FMT_STRING("Time: {}\n"
-				 "duration: {:1.3}\n"),
+				 "duration: {:1.3f}\n"),
 		      tag.duration.RoundS(),
 		      tag.duration.ToDoubleS());
 
diff --git a/src/command/PlayerCommands.cxx b/src/command/PlayerCommands.cxx
index 23dbeac6a..ca84468b7 100644
--- a/src/command/PlayerCommands.cxx
+++ b/src/command/PlayerCommands.cxx
@@ -171,7 +171,7 @@ handle_status(Client &client, [[maybe_unused]] Request args, Response &r)
 
 	if (player_status.state != PlayerState::STOP) {
 		r.Fmt(FMT_STRING(COMMAND_STATUS_TIME ": {}:{}\n"
-				 "elapsed: {:1.3}\n"
+				 "elapsed: {:1.3f}\n"
 				 COMMAND_STATUS_BITRATE ": {}\n"),
 		      player_status.elapsed_time.RoundS(),
 		      player_status.total_time.IsNegative()
@@ -181,7 +181,7 @@ handle_status(Client &client, [[maybe_unused]] Request args, Response &r)
 		      player_status.bit_rate);
 
 		if (!player_status.total_time.IsNegative())
-			r.Fmt(FMT_STRING("duration: {:1.3}\n"),
+			r.Fmt(FMT_STRING("duration: {:1.3f}\n"),
 				 player_status.total_time.ToDoubleS());
 
 		if (player_status.audio_format.IsDefined())
diff --git a/src/pcm/SoxrResampler.cxx b/src/pcm/SoxrResampler.cxx
index 1547afbc7..ea839c1f3 100644
--- a/src/pcm/SoxrResampler.cxx
+++ b/src/pcm/SoxrResampler.cxx
@@ -228,22 +228,22 @@ SoxrPcmResampler::Open(AudioFormat &af, unsigned new_sample_rate)
 	FmtDebug(soxr_domain, "soxr engine '{}'", soxr_engine(soxr));
 	if (soxr_use_custom_recipe)
 		FmtDebug(soxr_domain,
-			 "soxr precision={:0.0}, phase_response={:0.2}, "
-			 "passband_end={:0.2}, stopband_begin={:0.2} scale={:0.2}",
+			 "soxr precision={:0.0f}, phase_response={:0.2f}, "
+			 "passband_end={:0.2f}, stopband_begin={:0.2f} scale={:0.2f}",
 			 soxr_quality.precision, soxr_quality.phase_response,
 			 soxr_quality.passband_end, soxr_quality.stopband_begin,
 			 soxr_io_custom_recipe.scale);
 	else
 		FmtDebug(soxr_domain,
-			 "soxr precision={:0.0}, phase_response={:0.2}, "
-			 "passband_end={:0.2}, stopband_begin={:0.2}",
+			 "soxr precision={:0.0f}, phase_response={:0.2f}, "
+			 "passband_end={:0.2f}, stopband_begin={:0.2f}",
 			 soxr_quality.precision, soxr_quality.phase_response,
 			 soxr_quality.passband_end, soxr_quality.stopband_begin);
 
 	channels = af.channels;
 
 	ratio = float(new_sample_rate) / float(af.sample_rate);
-	FmtDebug(soxr_domain, "samplerate conversion ratio to {:.2}", ratio);
+	FmtDebug(soxr_domain, "samplerate conversion ratio to {:0.2f}", ratio);
 
 	/* libsoxr works with floating point samples */
 	af.format = SampleFormat::FLOAT;